74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 3-STATE 1-of-8 Line Data Selector/Multiplexer. NOTES: a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/ mA LOW. SN54/74LS 8- INPUT MULTIPLEXER. WITH 3-STATE OUTPUTS. LOW POWER SCHOTTKY. 74LS datasheet, 74LS circuit, 74LS data sheet: HITACHI – 1 of 8 Data Selectors/Multiplexers(with strobe and three-state outputs),alldatasheet.

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This is bright er: These powers can only sink current. If you’re in a moderately lit room it will be clearly visible.

They are quite dim. I bet the person in the video has chosen the current limiting resistors a bit on the conservative side. Maybe as bright as the LED of an optical mouse in power save mode, not when it’s scanning the surface. I 74ls2251 consider his leds as ‘bright’. He’s built an RGB monome.

Fairchild Semiconductor 74LS Series Datasheets. 74LS, DM74LS Datasheet.

What do you mean by “de-activating the output drivers”? You’re using a lot of terminology that is new to me.


Also, when you say “it’s not guaranteed to last forever,” what does that mean? How would I wire all of this? What do you mean by daisy-chaining and piggy-backing, exactly?

Also he’s not multiplexing at all, which makes it dimmer again. As per its datasheet the can source 20mA or thereabouts and sink a bit more per channel. This should prevent short circuiting them. If two or more channels are physically wired to act as one, this number can go up. How bright will it be As I answered on instructables, my blog is your friend.

You’d still need current limiting resistors. This assumes that the daisy-chained and paralleled ones get the same data of course.

IC Datasheet: 74LS251

It has everything if you use shift registers only you’ll need. You mean that each anode pin on each LED needs a resistor?

The human eye is quite adaptable. If you’re in a cave, you’ll be fine.


Having said that, I can’t stress how grateful I am for your help. It looks a lot brighter on the datashfet than what your eyes will tell you. You don’t want two paralleled pins to have different logic states. Such an arrangement would live long enough to finish a presentation, possibly longer if not used abusively.

TTL Logic IC 74LS, DIP

Most if not all of the available led drivers can’t be used with your common cathode leds I don’t know if I’m being helpful Where datashedt the schematic do they need to go? If you used more advanced chips common anode leds Per article in the playground, chips can be wired such that they logically form a chain.

What do you mean by three resistors per LED?